根据首字母提示写出单词。

1. If we want to keep healthy, we should have a healthy, balanced d _____.

2. He catches a rare (罕见的) d _____ of the brain.

3. I s _____ a big office at school with twelve other teachers.

4. If Joe can't attend the meeting, I could go i _____.

5. Shella's i _____ in watching, studying, protecting the wild birds.

Chinese people believe that on Mid-Autumn Day. The moon is _____ and _____  than usual.[ ]

A. big, round                                                    

B. biggest, roundest

C. bigger ,rounder                                            

D. the biggest, the roundest